I would not rec. a tank for a beginner. I use tanks, but I have it where the room around the snakes is always the right temperature, thus no insulation is needed. I also found that with this setup, you can have NO drafts, or into the screen lid they will go. I allow no open windows in this room and things are situated so that no breezes come into the tanks.
Then there's the issue of humidity; to retain it, I place industrial plastic wrap over the lids, allowing some openness for air intake.
As a beginner, you should focus your energies on simply letting your snake acclimate, then getting it to feed, and all in a cage with the right temps/humidity; I would not suggest using a tank, as it takes awhile to get things right!